SM UB-7

SM UB-7 was a German Type UB I submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. She disappeared in the Black Sea in September 1916.

UB-7 was ordered in October 1914 and was laid down at the AG Weser shipyard in Bremen in November. UB-7 was a little over 28 metres (92 ft) in length and displaced between 127 and 141 tonnes (125 and 139 long tons), depending on whether surfaced or submerged. She carried two torpedoes for her two bow torpedo tubes and was also armed with a deck-mounted machine gun. UB-7 was originally one of a pair of UB I boats sent to the Austro-Hungarian Navy to replace an Austrian pair to be sent to the Dardanelles, and was broken into sections and shipped by rail to Pola in March 1915 for reassembly. She was launched in April and commissioned as SM UB-7 in the German Imperial Navy in May when the Austrians opted out of the agreement.

Although briefly a part of the Pola Flotilla at commissioning, UB-7 spent the majority of her career patrolling the Black Sea as part of the Constantinople Flotilla. The U-boat sank one ship of 6,011 GRT in September 1915. In October, she helped repel a Russian bombardment of Bulgaria. She was considered for transfer to the Bulgarian Navy, but disappeared in late September 1916 before a transfer could take place. Her fate is officially unknown, but sources report that may have struck a mine or been sunk by a Russian airplane.